Improved device for securing the tail-stocks of lathes



A. THOMAS.

Device for Securing Tail Stdcks of Lathes.

Patented March 6. 1866.

NEED STATES PATENT OFFICE.

ALFRED THOMAS, OF WORCESTER, MASSACHUSETTS.

Specification forming part of Letters Patent No. 53,058, dated March 6,1866.

To all whom it may concern Be it known that I, ALFRED THOMAS, ofWorcester, in the county of Worcester, in the State of Massachusetts,have invented a new and Improved Mode of Fastening Tail-Stocks to Engineand Turning Lathes; and I do hereby declare that the following is a fulland exact description thereof, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon.

The nature of my invention consists in fastening tail-stocks to engineand turning lathes, to their ways or beds, by means of a compound boltor mechanism so constructed as to admit of its being forced out of aperpendicular line, thereby shortening the distance between the bed orways of the engine and the support of the tail-stock of theturning-lathe by means of a forcing-screw or its equivalent, phelrebyfastening the tail-stock firmly to its )Gt To enable others skilled inthe art to make and use my invention, I will proceed to describe itsconstruction and operation.

1 construct my improvement to fasten tailstocks to engine andturninglathes in the following manner, substantially, reference beinghad to the inclosed drawings, and the letters thereon, delineating theseparate parts of the same.

' A is the bed or ways; B, tail-stock; U, the upper part of the lateralsliding portion of the tail-stock B, to which the spindle and center isattached, with all the usual and necessary parts to operate the same. Dis thetightening-screw, to force the compound bolt or mechanism out of aperpendicular line, thereby fastening the tail stock B to the bedfirmly. c e are two ratchet-wheels, which are made fast to tightening-screw D. ff are the pawls of the ratchet-wheels e c; G, thelever to which the pawls f f are attached by means of a common axisthrough the lever G, and by reversing the pawls f f, s0 as to throw theminto the teeth of the ratchetwheels 0 e, a forward and backward movementof the screw D can be obtained, thereby loosening or tightening thetail-stock B at pleasure with great ease and very little motion,although I do not confine myself to use of pawlsff and ratchets e e, asa common wheel, wrench, or handle can be used to turn tightening-screwD. H is a suspension bar or rod, to which the compound bolt or mechanismfor connecting the shoe or cross-head to the under part of the bed orways A, so

that when screw D is forced against the compound bolt or mechanism itwill throw it out of a perpendicular line and will draw all the partsfirmly together. i i are the lugs on which the suspension-rod H rests;jj are two cross-bars for the purpose of keeping the compound bolt ormechanism in a central position on suspension-bar H. k 70 areadjustingscrews for the lateral motion of the upper part ofthetail-stock B. l I are the lugs for receiving the ends of the screws 70 7M, upper arm of the compound bolt or mechanism, made with an eye,through which suspensionrod H is passed, and the lowerend is made with ahead rounded on the under side, so as to allow of a direct and evenstrain without injury to the bolt 01' head; N, a union-grasp,

to hold and connect all the federal parts of Y the compound bolt inpeaceful harmony with each other. It is made with recesses at the topand bottom to receive the heads of the upper and lower arms of thecompound bolt, and is made with apertures ample to be removed atpleasure; also, is made on the side next to tightening-screw D with aV-shaped recess to receive the taper-shaped end of the said screw D, toaccommodate the deflection of't-he compound bolt or mechanism; 0, thelower armof the compound bolt, with head on the upper end made the sameas the upper arm, M, and the lower end is passed through the shoe P,with a screw and nut on the same to adjust thelength of compound bolt ormechanism; P, the shoe with upward projecting guides, which pass throughguides q q, and made on and a part of the lower half of tail-stock B forthe purpose of preventing it from catching on the under side of the bedor way A when the tail-stock is moved on the ways, as the guides willkeep the shoe perpendicular and free from friction.

Havingthus fully described my invention, what I claim as new, and desireLetters Patout for, is-

1. The mechanism called the compound bolt, constructed .as described, incombination with lugs 45 i, suspension-bar H, substantially the same,and for the purpose set forth.

2. In combination with the compound bolt, the tightening-screw D,ratchet-wheels e e, pawls ff, and lever G, or\their equivalents,substantially in the manner and for the purpose set forth.

Witnesses: ALFRED THOMAS.

H. 0. RICE, DANIEL It. PRATT. t

